Cisco WS-2960-24LC-S Software Guide - Page 402
Configuring Port Security, Understanding Port Security, Secure MAC Addresses
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Configuring Port Security Chapter 19 Configuring Port-Based Traffic Control Configuring Port Security You can use the port security feature to restrict input to an interface by limiting and identifying MAC addresses of the stations allowed to access the port. When you assign secure MAC addresses to a secure port, the port does not forward packets with source addresses outside the group of defined addresses. If you limit the number of secure MAC addresses to one and assign a single secure MAC address, the workstation attached to that port is assured the full bandwidth of the port. If a port is configured as a secure port and the maximum number of secure MAC addresses is reached, when the MAC address of a station attempting to access the port is different from any of the identified secure MAC addresses, a security violation occurs. Also, if a station with a secure MAC address configured or learned on one secure port attempts to access another secure port, a violation is flagged. These sections contain this conceptual and configuration information: • Understanding Port Security, page 19-8 • Default Port Security Configuration, page 19-10 • Port Security Configuration Guidelines, page 19-10 • Enabling and Configuring Port Security, page 19-11 • Enabling and Configuring Port Security Aging, page 19-16 Understanding Port Security These sections contain this conceptual information: • Secure MAC Addresses, page 19-8 • Security Violations, page 19-9 Secure MAC Addresses You configure the maximum number of secure addresses allowed on a port by using the switchport port-security maximum value interface configuration command. Note If you try to set the maximum value to a number less than the number of secure addresses already configured on an interface, the command is rejected. The switch supports these types of secure MAC addresses: • Static secure MAC addresses-These are manually configured by using the switchport port-security mac-address mac-address interface configuration command, stored in the address table, and added to the switch running configuration. • Dynamic secure MAC addresses-These are dynamically configured, stored only in the address table, and removed when the switch restarts. • Sticky secure MAC addresses-These can be dynamically learned or manually configured, stored in the address table, and added to the running configuration. If these addresses are saved in the configuration file, when the switch restarts, the interface does not need to dynamically reconfigure them. 19-8 Catalyst 2960 Switch Software Configuration Guide OL-8603-04
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